Amido compounds and process for producing the same

ABSTRACT

A 6-aminocarbonylmethyl-4H-2,3-dioxin-4-one compounds can be produced by reacting a 6-halomethyl-4H-2,3-dioxin-4-one compound with a primary or secondary amine and carbon monoxide. The reaction may be carried out in the presence of a catalyst comprising a platinum group metal. 3-oxopentanedicarboxylic acid monoamides and 3-oxopentanedicarboxylic acid amide esters can be are produced by reacting 6-aminocarbonylmethyl-4H-2,3-dioxin-4-one compound with an alcohol or water. Using such intermediates, 6-aminocarbonylmethyl-4H-2,3-dioxin-4-one compound, 3-oxopentanedicarboxylic acid amide esters can provide in an easy and simple and efficient manner.

FIELD OF THE INVENTION

[0001] The present invention relates to an intermediate useful forobtaining 3-oxopentanedicarboxylic acid amide compounds, a process forproducing the same, and a process for producing 3-oxopentanedicarboxylicacid amide compounds using the above intermediate. The3-oxopentanedicarboxylic acid amide compounds is beneficial asintermediates of fine chemicals such as medicinals and agrochemicals andbeneficial as raw materials for polyamides.

BACKGROUND OF THE INVENTION

[0002] 3-oxopentanedicarboxylic acid amide compounds are compoundsuseful as intermediates of fine chemicals, such as medicinals andagrochemicals, and as raw materials for polyamides.

[0003] As a process for synthesizing the compound, for example, Journalof the American Chemical Society, 1979, pages 2171-2181 discloses aprocess for producing methyl N-t-butyl-3-oxoglutaramate which comprisesboiling mixture of dimethyl ester of 3-oxopentanedicarboxylic acid,p-toluenesulfonic acid and dioxane, and adding butylamine to the mixturedropwise for 9 hours. In this process, however, the conversion reactionof the ester into the amide proceeds slowly, and reaction operability isdecreased. Moreover, in this process, since an ester amide is producedfrom a diester, by-products such as diamide tend to form. Thus, it isdisadvantageous that the process is applied to an industrial productionof an ester amide.

[0004] JOURNAL OF THE CHEMICAL SOCIETY, 1962, pages 3553-3561 disclosesa process for synthesizing 3-oxopentanedicarboxylic acid amidecarboxylic acid (in particular, γ-(benzoylcarbamoyl)acetoacetic acid)which comprises synthesizing chloropyranooxazine from malonyl chlorideor pyrone acid chloride and benzonitrile, hydrolyzingchloropyranooxazine to form hydroxypyranooxazine, and treating theresulting oxazine with an acid. This process is, however,disadvantageous in the efficient utilization of the reactants because ofby-producing carbon dioxide. Moreover, when various substituents areintroduced into 3-oxopentanedicarboxylic acid amide carboxylic acid, thereaction step comes complicated.

SUMMARY OF THE INVENTION

[0005] Accordingly, it is an object of the present invention to provideamide compounds useful for producing 3-oxopentanedicarboxylic acid amidecompounds in an industrially advantageous manner, a process forproducing the same, and a process for producing 3-oxopentanedicarboxylicacid amide compounds using the same.

[0006] Another object of the invention is to provide novel3-oxopentanedicarboxylic acid amide compounds.

[0007] As a result of intensive investigations made to solve the aboveproblems, the present inventors found that, by using the specific amidecompound, 3-oxopentanedicarboxylic acid amide compounds can be producedefficiently. These findings have now led to completion of the presentinvention.

[0008] Thus, the novel amide compounds of the present invention arerepresented by the following formula (1):

[0009] wherein R¹, R², R³ and R⁴ are the same or different, eachrepresents a hydrogen atom, an aliphatic hydrocarbon group, an alicyclichydrocarbon group or an aromatic hydrocarbon group, the hydrocarbongroups may optionally have a substituent, R¹ and R² may form a ring withan adjacent nitrogen atom, and R³ and R⁴ may form a ring with anadjacent carbon atom.

[0010] The amide compound (1) can be produced by reacting a halogencompound represented by the following formula (2) with carbon monoxideand an amine represented by the following formula (3). The reaction iscarried out in the presence of a catalyst comprising at least oneelement selected from the group consisting of Group 8 elements, Group 9elements and Group 10 elements of the Periodic Table of Elements. In theformula (2), X may be an iodine or bromine atom. A halogen compound ofthe formula (2) in which X is a fluorine or chlorine atom is reactedwith carbon monoxide and the alcohol or water in the presence of atleast one member selected from among iodinating agents and brominatingagents.

[0011] wherein X is a halogen atom and R¹, R², R³ and R⁴ have the samemeanings as defined above.

[0012] According to the present invention, a dicarboxylic acid amidecompound represented by the following formula (5) can be produced byreacting the amide compound (1) with an alcohol or water represented bythe following formula (4).

[0013] wherein R represents a hydrogen atom, an aliphatic hydrocarbongroup, an alicyclic hydrocarbon group or an aromatic hydrocarbon group,the hydrocarbon groups may optionally have a substituent, and R¹ and R²have the same meaning as defined above.

[0014] The present invention also includes a novel dicarboxylic acidamide compound represented by the following formula (5a):

[0015] wherein R¹ represents a hydrogen atom, R² represents a cycloalkylgroup, and R⁵ represents an alkyl group, the cycloalkyl group and thealkyl group may optionally have a substituent.

DETAILED DESCRIPTION OF THE INVENTION

[0016] [Amide Compounds (1)]

[0017] Referring to the amide compound represented by the above formula(1), the aliphatic hydrocarbon groups represented by R¹, R², R³ and R⁴may be either straight chain or branched chain hydrocarbon groups, andmay be either saturated or unsaturated hydrocarbon groups. Examples ofthe aliphatic hydrocarbon groups include alkyl groups (preferably C₁₋₁₀alkyl groups, more preferably C₁₋₆ alkyl groups, in particular C₁₋₄alkyl groups), such as methyl, ethyl, propyl, isopropyl, butyl, isobutyland t-butyl groups; alkenyl groups (preferably C₂₋₆ alkenyl groups, inparticular C₂₋₄ alkenyl groups), such as vinyl, allyl, isopropenyl,1-butenyl and 2-butenyl groups; alkynyl groups (preferably C₂₋₆ alkynylgroups, in particular C₂₋₄ alkynyl groups), such as ethynyl, propynyl,1-butynyl and 2-butynyl groups.

[0018] The alicyclic hydrocarbon groups may be saturated or unsaturatedhydrocarbon groups. Examples of the alicyclic hydrocarbon groups includecycloalkyl groups (e.g., C₃₋₁₀ cycloalkyl groups, preferably C₄₋₈cycloalkyl groups, in particular C₄₋₆ cycloalkyl groups), such ascyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl and cyclooctyl groups;cycloalkenyl groups (e.g., C₃₋₁₀ cycloalkenyl groups, preferably C₄₋₈cycloalkenyl groups, in particular C₄₋₆ cycloalkenyl groups), such ascyclopropenyl, cyclobutenyl, cyclopentenyl, cyclohexenyl andcyclooctenyl groups; cycloalkynyl groups (e.g., C₄₋₈ cycloalkynylgroups, in particular C₅₋₆ cycloalkynyl groups), such as cyclopentynyl,cyclohexynyl and cyclooctynyl groups.

[0019] Examples of the aromatic hydrocarbon groups include aryl groups(e.g., C₆₋₁₀ aryl groups), such as phenyl and naphthyl groups; aralkylgroup groups (e.g., C₆₋₁₀ aryl-C₁₋₄ alkyl groups), such as benzyl andphenethyl groups.

[0020] The alicyclic hydrocarbon group and the aromatic hydrocarbongroup may form a condensed ring with, for example, a heterocycle.

[0021] The hydrocarbon groups may have a substituent. As thesubstituent, there may be mentioned, halogen atoms, such as fluorine,chlorine and bromine atoms; C₁₋₄ alkyl groups such as methyl and ethylgroups; acyl groups [e.g. alkylcarbonyl group (e.g., C₁₋₄ alkyl-carbonylgroups) such as acetyl group; arylcarbonyl groups (e.g., C₆₋₁₀aryl-carbonyl groups) such as benzoyl group], acyloxy groups [e.g.,alkylcarbonyloxy groups (e.g., C₁₋₄ alkyl-carbonyloxy groups) such asacetyloxy group; arylcarbonyloxy groups (e.g., C₆₋₁₀ aryl-carbonyloxygroups) such as benzoyloxy group], alkoxy groups (e.g., C₁₋₄ alkoxygroups) such as methoxy and ethoxy groups; alkoxycarbonyl groups (C₁₋₄alkoxy-carbonyl groups) such as methoxycarbonyl group; aryl groups(e.g., C₆₋₁₀ aryl groups) such as phenyl and naphthyl groups; aryloxygroups such as phenoxyl group; heterocyclic groups (e.g., 5- to8-membered heterocyclic groups such as pyridyl, piridino, piperidyl andpiperidino groups).

[0022] The ring formed by R¹ and R² together with an adjacent nitrogenatom includes a saturated or unsaturated heterocycle having at least onenitrogen atom as an ring-constituting atom, and may be either anaromatic or non-aromatic ring. As the heterocycles, there may bementioned, 5- to 8-membered heterocycles (in particular, 5- or6-membered heterocycles) such as pyrrole, pyrroline, pyrazole,imidazole, pyrrolidine, piperidine, piperazine, pyridine, triazine,carbazole, indole and purine rings. The heterocycles may have oxygenatom and/or sulfur atom as a ring-constituting atom. As theheterocycles, there may be mentioned, heterocycles containing nitrogenatom and oxygen atom such as oxazolidine, oxazolone, oxazine,oxadiazine, oxaziazole, oxatriazole and morpholine rings; heterocyclescontaining nitrogen atom and sulfur atom such as thiazan, thiazine,thiazolidine, thiazoline, thiazole, thiadiazine, thiadiazoline andthiadiazole rings; heterocycles containing nitrogen, oxygen and sulfuratoms such as oxathiazine ring. The heterocycle is usually a 5-to8-membered ring, in particular, 5- or 6-membered ring.

[0023] The ring formed by R³ and R⁴ together with an adjacent carbonatom includes alicyclic hydrocarbon rings corresponding to theabove-mentioned alicyclic hydrocarbon groups (e.g., C₃₋₁₀ cycloalkanes,C₃₋₁₀ cycloalkenes), aromatic hydrocarbon rings corresponding to theabove-mentioned aromatic,hydrocarbon groups (e.g., benzene ring) andheterocycles.

[0024] Preferred as R¹ and R² are alkyl groups (in particular, C₁₋₆alkyl groups), cycloalkyl groups (e.g., C₃₋₁₀ cycloalkyl groups, inparticular C₅₋₈ cycloalkyl groups), aryl groups (in particular, C₆₋₁₀aryl groups) and aralkyl groups (e.g., C₆₋₁₀ aryl-C₁₋₄ alkyl groups suchas benzyl and phenethyl groups). Preferred as R¹ and R² form a 5- or6-membered heterocycle together with an adjacent nitrogen atom (e.g.,pyrrolidine, piperidine, pyridine rings). R³ and R⁴ are preferably alkylgroups, more preferably C₁₋₄ alkyl group (in particular, C₁₋₂ alkylgroup).

[0025] As such amide compounds (1), there maybe mentioned, among others,6-N—C₁₋₄ alkylaminocarbonylmethyl-2,2-diC₁₋₄ alkyl-4H-1,3-dioxin-4-one(e.g. 6-N-methylaminocarbonylmethyl-2,2-dimethyl-4H-1,3-dioxin-4-one,6-N-ethylaminocarbonylmethyl-2,2-dimethyl-4H-1,3-dioxin-4-one and6-N-t-butylaminocarbonylmethyl-2,2-dimethyl-4H-1,3-dioxin-4-one;6-N,N-diC₁₋₄ alkylaminocarbonylmethyl-2,2-diC₁₋₄alkyl-4H-1,3-dioxin-4-one (e.g.6-N,N-dimethylaminocarbonylmethyl-2,2-dimethyl-4H-1,3-dioxin-4-one and6-N-ethyl-N-methyl-aminocarbonylmethyl-2,2-dimethyl-4H-1,3-dioxin-4-one);6-N—C₆₋₁₀ arylaminocarbonylmethyl-2,2-diC₁₋₄ alkyl-4H-1,3-dioxin-4-one;6-N—(C₆₋₁₀ aryl-C₁₋₄ alkyl)aminocarbonylmethyl-2,2-diC₁₋₄alkyl-4H-1,3-dioxin-4-one;6-(1-pyrrolyl)carbonylmethyl-2,2-dimethyl-4H-1,3-dioxin-4-one,6-(1-pyrrolinyl)carbonylmethyl-2,2-dimethyl-4H-1,3-dioxin-4-one,6-(1-pyrrolidinyl)carbonylmethyl-2,2-dimethyl-4H-1,3-dioxin-4-one,6-piperidinocarbonylmethyl-2,2-dimethyl-4H-1,3-dioxin-4-one,6-pyridinocarbonylmethyl-2,2-dimethyl-4H-1,3-dioxin-4-one,6-(1-pyrazolyl)carbonylmethyl-2,2-dimethyl-4H-1,3-dioxin-4-one,6-(1-indolyl)carbonylmethyl-2,2-dimethyl-4H-1,3-dioxin-4-one,6-morpholinocarbonylmethyl-2,2-dimethyl-4H-1,3-dioxin-4-one,6-(7-purinyl)carbonylmethyl-2,2-dimethyl-4H-1,3-dioxin-4-one,6-(9-carbazolyl)carbonylmethyl-2,2-dimethyl-4H-1,3-dioxin-4-one,6-(1-imidazolyl)carbonylmethyl-2,2-dimethyl-4H-1,3-dioxin-4-one.

[0026] [Process for Producing the Amide Compounds (1)]

[0027] The amide compounds (1) can be produced by reacting a halogencompound represented by the above formula (2) with carbon monoxide andan amine represented by the above formula (3). The reaction order ofeach component is not particularly limited. The reaction of the halogencompound (2) with the amine (3) may be carried out in coexistence ofcarbon monoxide, and the halogen compound (2) may be reacted with carbonmonoxide, followed by reacting with the amine (3).

[0028] Referring to the above halogen compound (2), X is, for example, ahalogen atom such as a fluorine, chlorine, bromine or iodine atom. Amongthese halogen atoms, a bromine or iodine atom is preferred.

[0029] In cases where X is a fluorine or chlorine atom, to the reactionsystem for producing the amide compound (1) is added an iodinating agent(e.g., iodine, alkali metal iodides (potassium iodide, sodium iodide,etc.)) or a brominating agent (e.g., bromine, alkali metal bromides(sodium bromide, potassium bromide, etc.)) so that the atom X may beconverted into an iodine or bromine atom. When the iodinating orbrominating agent is used, an amount of the iodinating or brominatingagent may be selected within the wide range of a catalytic amount to anequivalent mole amount relative to the halogen compound (in which X is achlorine or fluorine atom), and is, for example, about 0.001 to 0.8 mol,preferably about 0.005 to 0.3 mol, more preferably about 0.01 to 0.2mol, per 1 mol of the halogen compound (in which X is a chlorine orfluorine atom).

[0030] Carbon monoxide may be pure carbon monoxide gas, and may be usedas a mixed gas with an inert gas (e.g., nitrogen, argon, helium).

[0031] The amount of carbon monoxide is not less than 1 mol and isselected from a wide range of, for example, about 1 to 10,000 mol,preferably about 1 to 1,000 mol, more preferably about 1 to 100 mol) per1 mol of the halogen compound (2). The reaction is usually carried outin a carbon monoxide-containing atmosphere (preferably an atmosphere ofcarbon monoxide).

[0032] In the reaction for producing the amide compound (1), the amountof the amine (3) may be selected, depending on species of amine, areaction manner, a reaction rate and others, within a wide range of, forexample, about 0.1 to 100,000 mol per 1 mol of the halogen compound (2).The amount of the amine (3) is usually about 0.5 to 1,000 mol (e.g.,about 0.8 to 100 mol) and preferably about 0.8 to 10 mol per 1 mol ofthe halogen compound (2).

[0033] The reaction with carbon monoxide may be carried out in thepresence of a carbonylation catalyst. As such catalyst, a catalystcomprising a Group 8 element of the Periodic Table of Elements (e.g.iron Fe, ruthenium Ru, osmium Os), a Group 9 element (e.g. cobalt Co,rhodium Rh, iridium Ir), a Group 10 element (e.g. nickel Ni, palladiumPd, platinum Pt) and so forth may be used. The catalyst may comprise theelement singly or in combination of two or more of them.

[0034] Preferred catalyst comprises a platinum group metal. As theplatinum group metal, there may be used, Group 8 elements of thePeriodic Table of Elements (ruthenium Ru, osmium Os), Group 9 elements(rhodium Rh, iridium Ir), Group 10 elements (palladium Pd, platinum Pt)[J. Dealey: “Inorganic Chemistry”, translated into Japanese by H.Hamaguchi and H. Kanno, published by Tokyo Kagaku Dojin (1982), page 360or elsewhere]. Among these elements, Group 10 elements of the PeriodicTable of Elements, in particular Pd are preferred.

[0035] The valence of the metal constituting the catalyst isparticularly limited and is usually about 0 to 4 valences and preferablyabout 0 to 2 valences.

[0036] The catalyst is usually used as a simple substance, or a compoundor complex containing the metal element. As examples of metal-containingcompound, there may be mentioned metal salts [e.g., inorganic acid saltssuch as hydrochloric acid salts, sulfuric acid salts, nitric acid salts,salts with carbonic acid (e.g. carbonates, hydrogen carbonates), saltswith phosphoric acid (e.g. phosphates, hydrogen phosphates, dihydrogenphosphates), and boric acid salts; organic acid salts such as carboxylicacid salts (e.g., fatty acid salts such as formates, acetates, lactates,oxalates, naphthenate); thiocyaniate, halides (e.g. chlorides, bromides)and so forth.

[0037] As the complex, there may be mentioned a complex resulting fromcoordination of a ligand to the metal element or the metal-containingcompound. As examples of the ligand, there may be mentioned phosphoruscompounds such as phosphines (e.g. trialkylphosphines such astri(n-butyl)phosphine; triarylphosphines such as triphenylphosphine),nitrile, OH (hydroxo), alkoxyl groups (e.g. methoxy and ethoxy groups),acyl groups (e.g. acetyl and propionyl groups), alkoxycarbonyl groups[e.g. methoxycarbonyl (acetato) and ethoxycarbonyl groups],acetylacetonato, cyclopentadienyl group, halogen atoms (e.g., chlorine,bromine), CO, oxygen atom, H₂O (aquo), nitrogen-containing compounds(e.g., NH₃(ammine), NO, NO₂(nitro), NO₃(nitrato), alkylenediamide (e.g.,ethylenediamine), pyridine, phenanthroline) and so forth. In the complexor complex salt, the same kind or different kind of ligands maycoordinate singly or in combination of two or more of them. The complexcan be composed of a suitable combination of the metal or themetal-containing compound with the ligand.

[0038] The metal-containing catalyst may be a homogeneous one or aheterogeneous one. The catalyst may be a solid catalyst supporting thecatalyst component on a support. As the support, there may be mentioneda porous support such as activated carbon, zeolite, silica (e.g., silicagel), alumina, silica-alumina, bentonite.

[0039] These catalysts may be used alone or in combination.

[0040] When the catalyst is a palladium-based one, for instance, thecatalyst includes, among others, palladium nitrate, palladium chloride,palladium acetate, acetylacetonatopalladium(II),tetraamminepalladium(II) chloride, bis(ethylenediamine)palladium(II)chloride, potassium tetrachloropalladate(II), potassiumtetranitropalladate(II), dichloro-bis(trialkylphosphine)palladium(II),dimethyl-bis(triethylphosphine)palladium(II),biscyclopentadienylpalladium(II),tricarbonylcyclopentadienylpalladium(I),dichloro-μ-bis[bis(dimethylphosphino)methane]dipalladium(I),tetrakis(triphenylphosphine)palladium(0),bis(tricyclohexylphosphine)palladium(0),tetrakis(triethylphosphito)palladium(0),carbonyl-tris(triphenylphosphine)palladium(0),bis(cycloocta-1,5-diene)palladium(0) andtris(dibenzylideneacetone)dipalladium(0).

[0041] The amount of the catalyst is usually about 0.001 to 1 mol,preferably about 0.01 to 0.5 mol, more preferably, 0.01 to 0.2 mol per 1mol of the halogen compound (2).

[0042] As the reaction progresses, a halic acid is generated in thereaction system. For neutralizing this halic acid, a base may be addedto the reaction system. As examples of the base, there may be mentionedinorganic bases, for example alkali metal or alkaline earth metalhydroxides (e.g. sodium hydroxide, potassium hydroxide, magnesiumhydroxide, calcium hydroxide), alkali metal or alkaline earth metalcarbonates (e.g. sodium carbonate, potassium carbonate, magnesiumcarbonate, calcium carbonate), alkali metal or alkaline earth metalhydrogencarbonates (e.g. sodium hydrogencarbonate, potassiumhydrogencarbonate, magnesium hydrogencarbonate, calciumhydrogencarbonate), alkali metal or alkaline earth metal carboxylates(e.g., sodium acetate, potassium acetate, magnesium acetate, calciumacetate); organic bases such as triC₁₋₄ alkylamines (e.g.,triethylamine), heterocyclic amine compounds (e.g., heterocyclictertiary amine such as pyridine), C₁₋₄ alkylanilines (e.g. tertiaryamines such as N,N-dimethylaniline) and so forth. Incidentally, a hallicacid may be neutralized with an excess of the amine (3) in lieu of thesebases. These bases may be used singly or two or more of them may be usedin combination.

[0043] The reaction may be carried out in the presence or absence of asolvent. The solvent may be any one, without any particular limitation,provided that the progress of the reaction is not inhibited and thereactants are soluble therein. As examples of the solvent, there may bementioned ketones (e.g., acetone and methyl ethyl ketone), ethers (e.g.,1,4-dioxane, tetrahydrofuran and diethylether), nitrites (e.g.,acetonitrile and benzonitrile), sulfoxides (e.g., dimethylsulfoxide),sulfones (e.g., sulfolane), aliphatic hydrocarbons (e.g., pentane,hexane and octane), aromatic hydrocarbons (e.g., benzene and toluene),halogen-containing compounds (e.g., methylene chloride, chloroform,bromoform, chlorobenzene and bromobenzene). The amount of the solvent isnot particularly restricted but should be such that the reactants(halogen compound (2) etc.) can be dissolved therein, and may beselected within a range of, for example, about 1 to 1,000 parts byweight per 1 part by weight of the halogen compound (2).

[0044] This reaction is usually carried out at about ordinary pressure(or atmospheric pressure) to 500 atmospheres (about 50 MPa), preferablyat about ordinary pressure to 100 atmospheres (about 10 MPa), morepreferably at about ordinary pressure to 10 atmospheres (about 1 MPa).If necessary, the reaction may be carried out under reduced pressure forapparatus and/or operational reasons.

[0045] In the reaction system, the reaction with carbon monoxide may becarried out just by bring carbon monoxide into contact with the otherreactants, and may be carried out not only by gas-liquid contacting butalso by blowing carbon monoxide into solution through a blowing tube.

[0046] The reaction temperature is not particularly restricted as so faras the reaction temperature may be not less than the melting point andnot more than the boiling point of the reaction system under a reactionconditions, and is, for example, about −30° C. to 200° C., preferablyabout −10° C. to 100° C. The reaction efficiently proceeds even under amild condition of a room temperature (e.g., about 5 to 40° C.).

[0047] [Process for Producing the Dicarboxylic Acid Amide Compounds]

[0048] According to the present invention, the dicarboxylic acid amidecompounds (monoamides of dicarboxylic acid or dicarboxylic acid amideesters) represented by the following formula (5) can be produced byreacting the above amide compound (1) with an alcohol or waterrepresented by the following formula (4).

[0049] Wherein R⁵ represents hydrogen atom, an aliphatic hydrocarbongroup, an alicyclic hydrocarbon group or an aromatic hydrocarbon group,these groups may optionally have a substituent. R¹ and R² have the samemeanings as defined.

[0050] In this reaction, the synthesis method of the amide compound (1)is not particularly limited, and the amide compound (1) may be preparednot only by the above-mentioned process for producing the amidecompounds (1) but also by other processes.

[0051] In the formulae (4) and (5), as examples of an aliphatichydrocarbon group, an alicyclic hydrocarbon group, an aromatichydrocarbon group represented by R⁵, and of a substituent which thesehydrocarbon groups may have, there may be mentioned those groupsmentioned hereinabove referring to R¹ to R⁴. Preferred as R⁵ are ahydrogen atom, C₁₋₁₀ aliphatic hydrocarbon groups (in particular C₁₋₆alkyl groups), C₄₋₈ alicyclic hydrocarbon groups and the like. Amongthese groups, C₁₋₄ alkyl groups such as methyl and ethyl groups arepreferred.

[0052] When R¹ and R² form a ring, it is not necessary for R¹ and R² ofthe amide compound (2) as a starting material to form a ring, and thering may form after the preparation of a dicarboxylic acid amidecompound (5).

[0053] In the reaction for producing a dicarboxylic acid amide compound(5), the amount of alcohol or water (4) may be selected depending on astarting material, a reaction manner and a reaction rate, and is about0.1 to 100,000 mol, preferably about 0.5 to 1,000 mol, more preferablyabout 0.8 to 100 mol, per 1 mol of the amide compound (1).

[0054] The production reaction of the dicarboxylic acid amide compound(5) can proceed by heating or the other means even in the absence of acatalyst. The reaction may be carried out in the presence of a catalystto be promoted. As examples of the catalyst, there may be mentionedvarious acid catalysts, for example, inorganic acids (e.g. sulfuricacid, hydrochloric acid, phosphoric acid, nitric acid), organic acids[carboxylic acid (e.g., C₁₋₁₀ saturated or unsaturated mono- orpolycarboxylic acid such as acetic acid and propionic acid), sulfonicacids (e.g., C₁₋₆ alkanesulfonic acids such as methanesulfonic acid andethanesulfonic acid; aromatic sulfonic acids such as benzenesulfonicacid and p-toluenesulfonic acid), halogenated organic acids (e.g.,halogenated carboxylic acids such as trifluoroacetic acid; halogenatedalkanesulfonic acids such as trifluoromethanesulfonic acid)] and solidacids [sulfuric acid salts (e.g. calcium sulfate), metal oxides (e.g.SiO₂, Al₂O₃), zeolites (e.g. acidic OH-containing Y, X or A typezeolites), heteropolyacids, ion exchange resins (e.g., cation exchangeresins such as H type)]. The catalyst may be used singly or incombination.

[0055] The amount of the catalyst is not particularly restricted and is,for example, about 0.001 to 1 mol, preferably about 0.01 to 0.2 mol, per1 mol of the amide compound (1).

[0056] The reaction may be carried out in the presence or absence of asolvent. As a solvent, any of those solvents which can be used in theproduction of the amide compounds (1) mentioned above can be used. Thealcohol or water (4) may be used as a solvent.

[0057] This reaction can be carried out usually at ordinary oratmospheric pressure. The reaction may be carried out under reducedpressure or under pressure for reaction conditions, reaction apparatusand/or operational reasons.

[0058] The reaction temperature may be usually between the melting pointto the boiling point of the reaction system under such reactionconditions as mentioned above and is, for example, about −30° C. to 300°C., preferably about −10° C. to 200° C.

[0059] The production of the amide compounds (1) and the dicarboxylicacid amide compounds (5) may be carried out by a conventional methodsuch as batchwise, semi-batchwise and continuous systems.

[0060] When the dicarboxylic acid (5) is produced after the amidecompound (1) is produced according to the process of the presentinvention, the amid compound (1) may be isolated or purified andsubjected to the production step of the dicarboxylic acid (5), and maybe subjected to the production step without isolation or purification.

[0061] The amide compounds (1) and the dicarboxylic acid amide compounds(5) can be easily separated and purified respectively by a conventionalmethod such as filtration, concentration, distillation, extraction, ionexchange, electrodialysis, crystallization, recrystallization,adsorption, membrane separation, centrifugation, chromatography (columnchromatography, etc.), or a combination means thereof.

[0062] [Novel Dicarboxylic Acid Amide Compounds]

[0063] According to the process of the present invention, noveldicarboxylic acid amide compounds represented by the following formula(5a) can be produced.

[0064] wherein R¹ represents a hydrogen atom, R² represents a cycloalkylgroup, R⁵ represents an alkyl group, and the cycloalkyl group and thealkyl group may optionally have a substituent.

[0065] As examples of cycloalkyl groups represented by R², there may bementioned the cycloalkyl groups mentioned hereinabove referring to R¹ toR⁴ of the formula (1). As examples of alkyl groups represented by R⁵,there may be mentioned the alkyl groups mentioned hereinabove referringto R¹ to R⁴. As examples of substituents which these groups may have,there may be mentioned various substituents mentioned hereinabovereferring to R¹ to R⁴.

[0066] Among such dicarboxylic acid amide compounds (5a), asdicarboxylic acid monoamides, there may be mentioned3-oxopentanedicarboxylic acid N—C₅₋₁₀ cycloalkyl amide such as3-oxopentanedicarboxylic acid N-cyclohexyl amide. As dicarboxylic acidamide ester, there may be mentioned 3-oxopentanedicarboxylic acidN—C₅₋₁₀ cycloalkyl amide C₁₋₆ alkyl ester such as3-oxopentanedicarboxylic acid N-cyclopentyl amide ethyl ester,3-oxopentanedicarboxylic acid N-cyclohexyl amide ethyl ester.

[0067] Such novel dicarboxylic acid amide compounds can be produced bythe above process for producing the dicarboxylic acid amide compounds(5) and is useful as intermediates for fine chemicals such as medicinalsand agrochemicals (agricultural chemicals) and as starting materials forpolyamides.

[0068] According to the present invention, 3-oxopentanedicarboxylic acidamide compound can be efficiently produced since6-aminocarbonylmethyl-4H-1,3-dioxin-4-ones, which are novel compounds isemployed. Moreover, using starting materials relatively easy to obtainand handle, 6-aminocarbonylmethyl-4H-1,3-dioxin-4-ones and further3-oxopentadicarboxylic acid amide compounds can be produced under a mildcondition. Thus, the process of the present invention is broadly used inthe various fields and is advantageous for industrial or commercialproduction.

EXAMPLES

[0069] The following examples illustrate the present invention in moredetail. They are, however, by no means limitative of the scope of theinvention. In the following examples, a methyl group is sometimesabbreviated as Me, an ethyl group as Et, an isopropyl group as i-Pr, atertiary butyl group as t-Bu, a benzyl group as PhCH₂, a cyclohexylgroup as c-Hex, tetrahydrofuran as THF.

[0070] The IR spectra were recorded on a PERKIN-ELMER 1600 Series FT-IRspectrophotometer.

[0071] The NMR spectra were recorded on a BRUKER AM500 spectrometer at500 MHz (¹H-NMR) or 125.7 MHz (¹³C-NMR) with trimethylsilane (TMS) as aninternal standard.

[0072] The MS spectra were recorded on a Thermoquest LCQ spectrometerusing the syringe method and the ionization mode APCI for detectingpositive ions.

Example 1

[0073] Synthesis of6-N-benzylaminocarbonylmethyl-2,2-dimethyl-4H-1,3-dioxin-4-one(synthesis from 6-chloromethyl-2,2-dimethyl-4H-1,3-dioxin-4-one)

[0074] A 50-mL two-necked flask was charged with 0.100 g (0.564 mmol) ofpalladium chloride, 0.782 g (5.66 mmol) of potassium carbonate and 0.940g (5.66 mmol) of potassium iodide, and a carbon monoxide atmosphere wasproduced in the system by equipping, in the flask, a balloon(atmospheric pressure) blowing carbon monoxide. To this reaction mixturewere added 10 mL of toluene, 0. 788 g (7.35 mmol) of benzylamine and 1.0g (5.66 mmol) of 6-chloromethyl-2,2-dimethyl-4H-1,3-dioxin-4-one, andthe mixture was stirred at room temperature for 18 hours in the carbonmonoxide atmosphere.

[0075] After completion of the reaction, the reaction mixture wasfiltered and the filtrate obtained was concentrated. To the condensedfiltrate were added 50 mL of ethyl acetate and 25 mL of water and theobject compound was extracted into an organic phase. The organic phaseseparated was dried over anhydrous sodium sulfate, filtered andconcentrated to give 0.950 g of a dark brown residue.

[0076] This residue was subjected to ¹H-NMR spectroscopy foridentification, and as a result, a conversion of the substrate was 68%and 6-N-benzylaminocarbonylmethyl-2,2-dimethyl-4H-1,3-dioxin-4-one (1A)was formed.

[0077] The residue was purified by silica gel thin layer chromatography(mobile phase: hexane/ethyl acetate=1/1 (volume ratio)) and 70.0 mg ofthe compound (1A) was obtained. The Rf value was 0.30. The IR spectrum,NMR spectrum and MS spectrum of the compound (1A) are shown below.

[0078] IR (neat): 3312, 2927, 1425, 733 cm⁻¹

[0079]¹H-NMR (CDCl₃) ppm: 1.64 (s, 6H, CMe₂), 3.17 (s, 2H, CH₂CO), 4.44(d, 2H, J=5.7 Hz, C₆H₅CH₂), 5.40 (s, 1H, CH═C), 7.22-7.35 (m, 5H, C₆H₅)

[0080]¹³C-NMR (CDCl₃) ppm: 24.9 (CMe₂), 41.5 (CH₂CO), 43.8 (CH₂NH), 96.1(HC═), 107.2 (Me₂C), 127.6 (C₆H₅), 127.7 (C₆H₅), 128.6 (C₆H₅), 128.7(C₆H₅), 137.9 (C₆H₅), 161.0 (CH₂—C═), 165.4 (CONH), 165.9(═C—CO—O—CMe₂-)

[0081] CI-MS (m/z): 276 (M⁺+1, 100%).

Example 2

[0082] Synthesis of6-N-phenylaminocarbonylmethyl-2,2-dimethyl-4H-1,3-dioxin-4-one

[0083] The reaction was carried out in the same manner as in Example 1except that 7.35 mmol of aniline in lieu of benzylamine, andtetrahydrofuran as a solvent in lieu of toluene were employed to give1.500 g of a residue. This residue was subjected to ¹H-NMR spectrometryfor identification, and as a result, a conversion of the substrate was100% and 6-N-phenylaminocarbonylmethyl-2,2-dimethyl-4H-1,3-dioxin-4-one(2A) was formed (yield 91%). The NMR spectrum data on this compound (2A)are shown below.

[0084]¹H-NMR (CDCl₃) ppm: 1.73 (s, 6H, CMe₂), 3.33 (s, 2H, CH₂CO), 5.49(s, 1H, CH═C), 7.30-7.38 (m, 3H, C₆H₅), 7.46-7.50 (m, 2H, C₆H₅).

Example 3

[0085] Synthesis of6-N-cyclohexylaminocarbonylmethyl-2,2-dimethyl-4H-1,3-dioxin-4-one

[0086] The reaction was carried out in the same manner as in Example 1except that 7.35 mmol of cyclohexylamine in lieu of benzylamine, andtetrahydrofuran as a solvent in lieu of toluene were employed to give0.920 g of a residue. This residue was subjected to ¹H-NMR spectrometryfor identification, and as a result, a conversion of the substrate was100% and6-N-cyclohexylaminocarbonylmethyl-2,2-dimethyl-4H-1,3-dioxin-4-one (3A)was formed (yield 22%). The NMR spectrum data on this compound (3A) areshown below.

[0087]¹H-NMR (CDCl₃) ppm: 1.09-1.21 (m, 2H, C₆H₁₁), 1.33-1.43 (m, 2H,C₆H₁₁), 1.60-1.69 (m, 2H, C₆H₁₁), 1.70-1.76 (m, 8H, C₆H₁₁, CMe₂),1.90-1.96 (m, 2H, C₆H₁₁), 3.12 (s, 2H, CH₂CO), 3.75-3.85 (m, 1H, C₆H₁₁),5.41 (s, 1H, CH═C).

Example 4

[0088] Synthesis of6-N-t-butylaminocarbonylmethyl-2,2-dimethyl-4H-1,3-dioxin-4-one

[0089] The reaction was carried out in the same manner as in Example 1except that 7.35 mmol of t-butylamine in lieu of benzylamine, andtetrahydrofuran as a solvent in lieu of toluene were employed to give1.670 g of a residue. This residue was subjected to ¹H-NMR spectrometryfor identification, and as a result, a conversion of the substrate was45% and 6-N-t-butylaminocarbonylmethyl-2,2-dimethyl-4H-1,3-dioxin-4-one(4A) was formed (yield 29%). The NMR spectrum data on this compound (4A)are shown below.

[0090]¹H-NMR (CDCl₃) ppm: 1.36 (s, 9H, t-Bu), 1.71 (s, 6H, CMe₂), 3.07(s, 2H, CH₂CO), 5.40 (s, 1H, CH═C).

Example 5

[0091] Synthesis of6-N,N-dimethylaminocarbonylmethyl-2,2-dimethyl-4H-1,3-dioxin-4-one

[0092] The reaction was carried out in the same manner as in Example 1except that 7.35 mmol of dimethylamine in lieu of benzylamine, andtetrahydrofuran as a solvent in lieu of toluene were employed to give0.720 g of a residue. This residue was subjected to ¹H-NMR spectrometryfor identification, and as a result, a conversion of the substrate was95% and6-N,N-dimethylaminocarbonylmethyl-2,2-dimethyl-4H-1,3-dioxin-4-one (5A)was formed (yield 38%). The NMR spectrum data on this compound (5A) areshown below.

[0093]¹H-NMR (CDCl₃) ppm: 1.71 (s, 6H, CMe₂), 2.30 (s, 6H, Me ₂NH), 3.03(s, 2H, CH₂CO), 5.46 (s, 1H, CH═C).

Example 6

[0094] Synthesis of6-piperidinoaminocarbonylmethyl-2,2-dimethyl-4H-1,3-dioxin-4-one

[0095] The reaction was carried out in the same manner as in Example 1except that 7.35 mmol of piperidine in lieu of benzylamine, andtetrahydrofuran as a solvent in lieu of toluene were employed to give1.380 g of a residue. This residue was subjected to ¹H-NMR spectrometryfor identification, and as a result, a conversion of the substrate was100% and6-piperidinoaminocarbonylmethyl-2,2-dimethyl-4H-1,3-dioxin-4-one(6A) wasformed (yield 71%). The NMR spectrum data on this compound (6A) areshown below.

[0096]¹H-NMR (CDCl₃) ppm: 1.41-1.46 (m, 2H, —CH₂CH₂CH₂N—), 1.55-1.62 (m,4H, —CH₂ CH₂CH₂N—), 1.69 (s, 6H, CMe₂), 2.41-2.45 (m, 4H, CH₂CH₂N—),3.03 (s, 2H, CH₂CO), 5.52 (s, 1H, CH═C).

Example 7

[0097] Synthesis of 3-oxopentanedicarboxylic acid phenylamide ethylester

[0098] 100 mg (0.399 mmol) of6-phenylaminocarbonylmethyl-2,2-dimethyl-4H-1,3-dioxin-4-one (7A), 20 mg(0.435 mmol) of ethyl alcohol were dissolved in 5 mL of xylene. Thereaction was carried out by heating the mixed solution at a temperatureof 140° C. for 6 hours. After the completion of the reaction, thesolution was condensed and purified by silica gel thin layerchromatography (mobile phase: hexane/ethyl acetate=1/1 (volume ratio))to give 20 mg (yield 20%) of the desired compound3-oxopentanedicarboxylic acid phenylamide ethyl ester (7B). The NMRspectrum data on this compound (7B) are shown below.

[0099]¹H-NMR (CDCl₃) ppm: 1.29 (t, 3H, Et), 3.62 (s, 2H, CH₂), 3.72 (s,2H, CH₂), 4.23 (q, 2H, Et), 7.10-7.15 (m, 1H, C₆H₅), 7.30-7.35 (m, 2H,C₆H₅), 7.51-7.54 (m, 2H, C₆H₅)

What is claimed is:
 1. A process for producing a dicarboxylic acid amidecompound of formula (5):

which comprises reacting an amide of formula (1):

with an alcohol or water of formula (4): R⁵OH   (4) wherein R¹, R², R³and R⁴ are the same or different, each represents a hydrogen atom, analiphatic hydrocarbon group, an alicyclic hydrocarbon group or anaromatic hydrocarbon group, the hydrocarbon groups may optionally have asubstituent, R¹ and R² may form a ring with an adjacent nitrogen atom,and R³ and R⁴ may form a ring with an adjacent carbon atom wherein R⁵represents a hydrogen atom, an aliphatic hydrocarbon group, an alicyclichydrocarbon group or an aromatic hydrocarbon group, the hydrocarbongroups may optionally have a substituent.
 2. A dicarboxylic acid amidecompound represented by the following formula (5a):

wherein R¹ represents a hydrogen atom, R² represents a cycloalkyl group,R⁵ represents an alkyl group, and the cycloalkyl group and the alkylgroup may optionally have a substituent.
 3. A dicarboxylic acid amidecompound as claimed in claim 2, wherein, in the formula (5a), R² is aC₅₋₁₀ cycloalkyl group and R⁵ is a C₁₋₆ alkyl group.